Auto Transformer — Study Resources & PYQs

Principle, operation and applications of an autotransformer.

Study resources

Testbook - Auto Transformer (Article) — Explains auto-transformer working, circuit diagram, advantages, disadvantages and applications compared to a two-winding transformer.
GATE Academy Plus - Basic Electrical Engineering (Video) — Covers auto-transformers as part of the transformer module in the full course playlist.
IGNOU eGyanKosh - Unit 4: Transformers (PDF) — Indian government open-courseware notes. Ideal transformer assumptions, no-load and on-load phasor diagrams, equivalent circuit and autotransformer, in exam language.
Electrical4U - Transformer Articles Index (Article) — Indian site. Index page linking to no-load/on-load operation, phasor diagrams, equivalent circuit, losses, testing and autotransformers.
Basic Electrical Engineering - OC Test and SC Test on Transformer (Video) — Indian faculty lecture demonstrating the open-circuit and short-circuit tests on a single-phase transformer with calculations.
NPTEL — Fundamentals of Electrical Engineering, IIT Kharagpur (Article) — Current IIT Kharagpur NPTEL course covering DC/AC circuits, three-phase circuits, resonance, transformers and electrical machines.
NPTEL — A Basic Course on Electric and Magnetic Circuits (Article) — Current IIT Kharagpur NPTEL course covering electric/magnetic circuits, phasors, three-phase systems and transformer-equivalent circuits.

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